I am getting an object reference not set to an instance of an object error when I scroll to the bottom of a DataGridView.
The grid has three columns; File Name; Columns; Database Columns.
I populate the grid by extracting the contents of a zip file, so I show the File name in the zip, the number of columns in the (pipe delimited) text file, and to start with, null in the "Database Columns" column.
Everything is fine up until this point. I can scroll up and down with no problems.
I then iterate through a TreeView, collect node values, and compare these values with the "File Name" column in the grid. If there is a match, the "Database Columns" column is filled in - and I can see the desired results.
What I find is that when I now scroll to the bottom of the grid, it thows an error:

Code:
System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Data.DataView.IsOriginalVersion(Int32 index)
   at System.Data.DataRowView.GetColumnValue(DataColumn column)
   at System.Data.DataColumnPropertyDescriptor.GetValue(Object component)
   at System.Windows.Forms.DataGridView.DataGridViewDataConnection.GetValue(Int32 boundColumnIndex, Int32 columnIndex, Int32 rowIndex)
   at System.Windows.Forms.DataGridViewCell.GetValue(Int32 rowIndex)
   at System.Windows.Forms.DataGridViewCell.PaintWork(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, Int32 rowIndex, DataGridViewElementStates cellState, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
   at System.Windows.Forms.DataGridViewRow.PaintCells(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow, DataGridViewPaintParts paintParts)
   at System.Windows.Forms.DataGridViewRow.Paint(Graphics graphics, Rectangle clipBounds, Rectangle rowBounds, Int32 rowIndex, DataGridViewElementStates rowState, Boolean isFirstDisplayedRow, Boolean isLastVisibleRow)
   at System.Windows.Forms.DataGridView.PaintRows(Graphics g, Rectangle boundingRect, Rectangle clipRect, Boolean singleHorizontalBorderAdded)
   at System.Windows.Forms.DataGridView.PaintGrid(Graphics g, Rectangle gridBounds, Rectangle clipRect, Boolean singleVerticalBorderAdded, Boolean singleHorizontalBorderAdded)
   at System.Windows.Forms.DataGridView.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.DataGridView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

And the space occupied by the DataGridView changes to show a huge red square in it.

Does the above mean anything to anybody?